[ruby/digest] Prefer `rb_const_get` over `rb_path2class` for direct constants

https://github.com/ruby/digest/commit/e5d30394b3

ext/digest/bubblebabble/bubblebabble.c

@@ -129,15 +129,14 @@ Init_bubblebabble(void)
 
     rb_require("digest");
 
-    rb_mDigest = rb_path2class("Digest");
-    rb_mDigest_Instance = rb_path2class("Digest::Instance");
-    rb_cDigest_Class = rb_path2class("Digest::Class");
-
 #if 0
     rb_mDigest = rb_define_module("Digest");
     rb_mDigest_Instance = rb_define_module_under(rb_mDigest, "Instance");
     rb_cDigest_Class = rb_define_class_under(rb_mDigest, "Class", rb_cObject);
 #endif
+    rb_mDigest = rb_digest_namespace();
+    rb_mDigest_Instance = rb_const_get(rb_mDigest, rb_intern_const("Instance"));
+    rb_cDigest_Class = rb_const_get(rb_mDigest, rb_intern_const("Class"));
 
     rb_define_module_function(rb_mDigest, "bubblebabble", rb_digest_s_bubblebabble, 1);
     rb_define_singleton_method(rb_cDigest_Class, "bubblebabble", rb_digest_class_s_bubblebabble, -1);

ext/digest/md5/md5init.c

@@ -53,9 +53,8 @@ Init_md5(void)
     mDigest = rb_define_module("Digest"); /* let rdoc know */
 #endif
     mDigest = rb_digest_namespace();
-    cDigest_Base = rb_path2class("Digest::Base");
+    cDigest_Base = rb_const_get(mDigest, rb_intern_const("Base"));
 
     cDigest_MD5 = rb_define_class_under(mDigest, "MD5", cDigest_Base);
-
     rb_iv_set(cDigest_MD5, "metadata", rb_digest_make_metadata(&md5));
 }

ext/digest/rmd160/rmd160init.c

@@ -49,9 +49,8 @@ Init_rmd160(void)
     mDigest = rb_define_module("Digest"); /* let rdoc know */
 #endif
     mDigest = rb_digest_namespace();
-    cDigest_Base = rb_path2class("Digest::Base");
+    cDigest_Base = rb_const_get(mDigest, rb_intern_const("Base"));
 
     cDigest_RMD160 = rb_define_class_under(mDigest, "RMD160", cDigest_Base);
-
     rb_iv_set(cDigest_RMD160, "metadata", rb_digest_make_metadata(&rmd160));
 }

ext/digest/sha1/sha1init.c

@@ -55,9 +55,8 @@ Init_sha1(void)
     mDigest = rb_define_module("Digest"); /* let rdoc know */
 #endif
     mDigest = rb_digest_namespace();
-    cDigest_Base = rb_path2class("Digest::Base");
+    cDigest_Base = rb_const_get(mDigest, rb_intern_const("Base"));
 
     cDigest_SHA1 = rb_define_class_under(mDigest, "SHA1", cDigest_Base);
-
     rb_iv_set(cDigest_SHA1, "metadata", rb_digest_make_metadata(&sha1));
 }

ext/digest/sha2/sha2init.c

@@ -40,8 +40,11 @@ Init_sha2(void)
 
     FOREACH_BITLEN(DECLARE_ALGO_CLASS)
 
+#if 0
+    mDigest = rb_define_module("Digest"); /* let rdoc know */
+#endif
     mDigest = rb_digest_namespace();
-    cDigest_Base = rb_path2class("Digest::Base");
+    cDigest_Base = rb_const_get(mDigest, rb_intern_const("Base"));
 
 #define DEFINE_ALGO_CLASS(bitlen) \
     cDigest_SHA##bitlen = rb_define_class_under(mDigest, "SHA" #bitlen, cDigest_Base); \